Tretí tréning pripomínal staré dobré časy, keď o prvé miesta bojovali tímy Renault, Ferrari a McLaren. Svoju silu potvrdil druhým a štvrtým miestom aj tím Brawn.
Výsledky 3. tréningu na VC Monaka:
| 1 | Fernando Alonso | Renault | 1:15,164 | - | 24 | |
| 2 | Jenson Button | Brawn-Mercedes | 1:15,233 | + 0,069 | 29 | |
| 3 | Heikki Kovalainen | McLaren-Mercedes | 1:15,278 | + 0,114 | 24 | |
| 4 | Rubens Barrichello | Brawn-Mercedes | 1:15,286 | + 0,122 | 26 | |
| 5 | Felipe Massa | Ferrari | 1:15,293 | + 0,129 | 23 | |
| 6 | Kimi Räikkönen | Ferrari | 1:15,382 | + 0,218 | 25 | |
| 7 | Lewis Hamilton | McLaren-Mercedes | 1:15,389 | + 0,225 | 23 | |
| 8 | Sebastian Vettel | Red Bull-Renault | 1:15,722 | + 0,558 | 23 | |
| 9 | Nico Rosberg | Williams-Toyota | 1:15,758 | + 0,594 | 23 | |
| 10 | Mark Webber | Red Bull-Renault | 1:15,985 | + 0,821 | 24 | |
| 11 | Kazuki Nakajima | Williams-Toyota | 1:16,103 | + 0,939 | 22 | |
| 12 | Adrian Sutil | Force India-Mercedes | 1:16,228 | + 1,064 | 30 | |
| 13 | Sébastien Bourdais | Toro Rosso-Ferrari | 1:16,301 | + 1,137 | 23 | |
| 14 | Giancarlo Fisichella | Force India-Mercedes | 1:16,317 | + 1,153 | 29 | |
| 15 | Nelson Piquet | Renault | 1:16,382 | + 1,218 | 27 | |
| 16 | Sébastien Buemi | Toro Rosso-Ferrari | 1:16,432 | + 1,268 | 22 | |
| 17 | Timo Glock | Toyota | 1:16,527 | + 1,363 | 29 | |
| 18 | Robert Kubica | BMW Sauber | 1:16,599 | + 1,435 | 26 | |
| 19 | Nick Heidfeld | BMW Sauber | 1:16,661 | + 1,497 | 22 | |
| 20 | Jarno Trulli | Toyota | 1:16,810 | + 1,646 | 26 |
Kvalifikácia začína o štrnástej hodine.
